From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E216119882F; Thu, 6 Jun 2024 14:15:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717683303; cv=none; b=mhhZF+K8ZIZwQpDmpd8Vp4nnArH3aT2WHx4JKOvu+HJr81pXOa1OzXm//3nyDLqJbOroq98giq2EBnNDvvs2qrlM94uKphjWCjjUwrhPzsfX34/OPeE0yOnsbLH+nU16Pp9uqwDBy5xP0W2zr1bRq2q+wGBNPv1TOg2Z1UqSIKw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717683303; c=relaxed/simple; bh=nu5DSimh7qRX33rnmi4X3QEFYN/OfIB9hHZj2burn5Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=A4/Q57apHZGZcf0XVCjhTEgyPA7UlWAnG3L54vLINTszOAaL6ZsjjbkvUo7yEX5LvGfm7IfJdHXttZlbU40c58RjExJn2uaQBFYdaa7PThXQbYpyxSUksWhIBTf5krNvS89yNL4cygTl5kFefeZpVPbbmqJttxElwA33L1kK0rU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bxbA0KI4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bxbA0KI4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6983C2BD10; Thu, 6 Jun 2024 14:15:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1717683302; bh=nu5DSimh7qRX33rnmi4X3QEFYN/OfIB9hHZj2burn5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bxbA0KI4KPlN2vup2Jdc2tHivo3kkRjMj3hhURTHy4nJzats0/qCGeJfoiqdpVsuc U6FcSIdns8iKHabWSa0E2lHiAeN242XrSoei/+IftPj9wOQPz6IvU1Ne9yiPGt8VVO IQxqG53MCLFwVeCl5cDOhtMETE1/R/fpQa20vo/E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Steve Glendinning , UNGLinuxDriver@microchip.com, Simon Horman , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.6 244/744] net: usb: smsc95xx: stop lying about skb->truesize Date: Thu, 6 Jun 2024 15:58:36 +0200 Message-ID: <20240606131740.226138804@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240606131732.440653204@linuxfoundation.org> References: <20240606131732.440653204@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit d50729f1d60bca822ef6d9c1a5fb28d486bd7593 ] Some usb drivers try to set small skb->truesize and break core networking stacks. In this patch, I removed one of the skb->truesize override. I also replaced one skb_clone() by an allocation of a fresh and small skb, to get minimally sized skbs, like we did in commit 1e2c61172342 ("net: cdc_ncm: reduce skb truesize in rx path") and 4ce62d5b2f7a ("net: usb: ax88179_178a: stop lying about skb->truesize") v3: also fix a sparse error ( https://lore.kernel.org/oe-kbuild-all/202405091310.KvncIecx-lkp@intel.com/ ) v2: leave the skb_trim() game because smsc95xx_rx_csum_offload() needs the csum part. (Jakub) While we are it, use get_unaligned() in smsc95xx_rx_csum_offload(). Fixes: 2f7ca802bdae ("net: Add SMSC LAN9500 USB2.0 10/100 ethernet adapter driver") Signed-off-by: Eric Dumazet Cc: Steve Glendinning Cc: UNGLinuxDriver@microchip.com Reviewed-by: Simon Horman Link: https://lore.kernel.org/r/20240509083313.2113832-1-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/usb/smsc95xx.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index 2fa46baa589e5..cbea246664795 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -1810,9 +1810,11 @@ static int smsc95xx_reset_resume(struct usb_interface *intf) static void smsc95xx_rx_csum_offload(struct sk_buff *skb) { - skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2); + u16 *csum_ptr = (u16 *)(skb_tail_pointer(skb) - 2); + + skb->csum = (__force __wsum)get_unaligned(csum_ptr); skb->ip_summed = CHECKSUM_COMPLETE; - skb_trim(skb, skb->len - 2); + skb_trim(skb, skb->len - 2); /* remove csum */ } static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb) @@ -1870,25 +1872,22 @@ static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb) if (dev->net->features & NETIF_F_RXCSUM) smsc95xx_rx_csum_offload(skb); skb_trim(skb, skb->len - 4); /* remove fcs */ - skb->truesize = size + sizeof(struct sk_buff); return 1; } - ax_skb = skb_clone(skb, GFP_ATOMIC); + ax_skb = netdev_alloc_skb_ip_align(dev->net, size); if (unlikely(!ax_skb)) { netdev_warn(dev->net, "Error allocating skb\n"); return 0; } - ax_skb->len = size; - ax_skb->data = packet; - skb_set_tail_pointer(ax_skb, size); + skb_put(ax_skb, size); + memcpy(ax_skb->data, packet, size); if (dev->net->features & NETIF_F_RXCSUM) smsc95xx_rx_csum_offload(ax_skb); skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */ - ax_skb->truesize = size + sizeof(struct sk_buff); usbnet_skb_return(dev, ax_skb); } -- 2.43.0